An apparatus and process using a high-power, short-pulsed thulium laser to output infrared laser pulses delivered through an optical fiber, for cutting and ablating biological tissue. The compound of the present invention has HIV integrase inhibitory action and is useful as an anti-HIV agent for the prophylaxis or therapy of AIDS. These steps can occur in either order. Preferably, the fuel supply stoppage section selectively sets the specific delay time to a different delay time depending upon the detected operating condition detection, e. A method for determining a physical position of a flight control surface of an aircraft is also disclosed.